Puzzling Puffy Planet Article

This article is about a planet scientists have discovered orbiting around a star 450 light years away. The planet is considered puffy because it has about the same density as cork. It is a bit bigger than Jupiter, yet it only has about 1/4th the density of water (Jupiter has a density of 133% of water). They believe the puffiness might be caused by heat from the star and heat from the friction of hydrogen and helium separating into layers in its atmosphere.

They said that the planet has an almost circular orbit around the star. Technically, the planet is accelerating, because its velocity is changing. It isn't gaining or losing speed, but since it is always turning around the star, the direction is changing. If it is like the planets in our solar system, its speed is constant.